Incredible Dragon Looks Best in a Race With One Pair in Aluminum and One in Steel

WASHINGTON, Pa.—Incredible Dragon, a black four-year-old Standardbred horse with big eyes, rounded the final turn in a harness race at the Meadows Racetrack and paced hard among the leaders toward the finish post.

Dragon, as trainer Paul Corey calls him, had been on a winning streak, and Mr. Corey has an explanation: two aluminum shoes on his front hoofs, and two steel shoes in back. "It took months to figure that out," Mr....